Vdash Making A New Dash -p3- Access

const utterance = new SpeechSynthesisUtterance(message); utterance.rate = 1.2; utterance.pitch = 1.0; synth.speak(utterance);

const speedFilter = new LowPassFilter(0.15); let smoothSpeed = speedFilter.filter(rawSpeed); For low-frequency data (e.g., 10Hz):

if (rpm >= this.thresholds[this.thresholds.length - 1]) this.blink();

const EventBus = { events: {}, on(event, callback) ... , emit(event, data) ... , off(event, callback) ... }; 2.1 Canvas vs DOM | Feature | Canvas | DOM | |---------|--------|-----| | Complex graphics | ✅ Excellent | ❌ Slow | | Text rendering | ⚠️ Manual | ✅ Easy | | Dynamic elements | ❌ Redraw all | ✅ Selective | | Performance | ✅ GPU accelerated | ⚠️ Layout thrashing | VDash Making A New Dash -P3-

Use Canvas for gauges/needles , DOM for text/data . 2.2 RequestAnimationFrame Loop function renderLoop() if (!VDash.isVisible) return; // Batch all updates batchUpdates();

class LowPassFilter constructor(alpha = 0.2) this.alpha = alpha; this.filtered = 0; filter(value) this.filtered = this.alpha * value + (1 - this.alpha) * this.filtered; return this.filtered;

function renderIfDirty() if (dirtyFlags.speed) updateSpeedDisplay(); if (dirtyFlags.rpm) updateRPMNeedle(); // Reset flags after render // Batch all updates batchUpdates()

3.1 Multiple Data Feeds const DataSources = simhub: url: 'ws://localhost:8888', parser: parseSimHub , udp: port: 9999, parser: parseUDP , serial: port: 'COM3', baud: 115200, parser: parseSerial ; function switchSource(source) disconnectAll(); connect(DataSources[source]);

record(data) if (!this.isRecording) return; this.buffer.push( timestamp: Date.now(), ...data );

// Usage if (fuelLevel < 5) voiceAlert('Low fuel, pit next lap', 'high'); 7.1 Simulated Data Generator class Simulator constructor() this.time = 0; start() setInterval(() => this.time += 0.016; const simData = Speed: 50 + 40 * Math.sin(this.time * 2), RPM: 3000 + 2000 * Math.sin(this.time * 4), Fuel: 50 - this.time * 0.5 ; VDash.emit('data:update', simData); , 16); this.filtered = 0

// Draw once per frame drawCanvas(); updateDOM();

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